Anyone Start Upgrading

Now that my Fpg is working, I've got the urge to tinker and mod. Has anyone tried the shooters design inner barrel, rocket valve or pro arms piston head? The last two parts are for the M18C but they should work in the Fpg. I'm averaging 330 fps at the moment and I would like to get up to 340-350 (local field limit for CQB)

Will the difference in diameter of the inner barrel affect fps by a lot? If so by how much roughly? I can hold off installing the rocket valve and piston head, but will probably order them with the inner barrel just in case. I'm also eyeing shooters design's reinforced part 10. couldn't hurt to have a spare.

I have the fpg and have put on the beta project single point sling attachment. I have a shooters design tbb but I could not figure out how to disassemble the inner barrel from the hop up unit. The fpg was the complete version, not the kit. I'm heading to asgi today and will be chronoing. Hopefully someone there can help me with the disassembly. I'll post my findings as soon as I can.

Previously, I installed a Beta Project single point sling and G&G upgraded recoil spring. I am also using three AABB extended mags. The AABB extended mags are pretty good, but not ideal for folding the FPG, but work well for reloads during game play. I'm using a Replica Aimpoint Micro red dot for optics (ditched the handle) and a surefire knock off light with an offset light mount. Pretty good setup for CQB.

Internally... well I never heard from anyone else, so I ended up installing the Shooters Design 6.03mm inner barrel. It netted roughly a 10 FPS increase. With the stock inner barrel, I was shooting about 332FPS (avg over 10 shots); after adding the inner barrel, it's about 345FPS (avg over 10 shots @ 70F). I will chrono again and get more accurate measurements. I have not tested the accuracy in a controlled environment, but from CQB play it seems pretty consistent with local brand .25g bbs. I also installed the Shooters Design Rocket Valve which unfortunately decreased my FPS drastically. Maybe I did something wrong, but it was shooting around 260FPS? I'll try again later. Lastly, I added the Shooters design reinforced loading ramp for durability.

The last upgrade/mod I might do is use a stock KWA G18C slide, just because it looks cool inside the gun lol, with the stock outer barrel and some reinforced parts for durability.

Just a little update. The Shooters design loading ramped broke very early ugh, but the stock ramp is holding up great.

The slide will fit and function but the fpg outter barrel won't fit into the M18C slide without modification. The m18c outter barrel is too short to accommodate the stock fpg inner barrel or the Shooters design inner barrel.

If you have the FPG complete version, there are about dozens of little changes on the M series design to work better with the FPG concept. So technically it's a better gun than the original FPG kit + G18. And obviously some parts from the complete FPG will not work well with a G18 parts.

The FPG kit is not a KWA product and is much different internally from the full KWA FPG. The 'upgrade' parts may work for the kit but most will not work for the KWA product so we don't discuss the kits on this site since they don't apply to KWA product.